Deer Park: Demographics & People
About 3,711 people live in Deer Park, in 1,285 households. Median age 41.2 years. (2.1y older than Lake County; 3.5y older than Illinois). Children under 18 are 29% of the population. Population is 80% White (non-Hispanic) and 8% Asian. The community is somewhat diverse (Simpson index 0.23). 78% of households are family-led. County is losing 127,111 residents per year (2022-2023). County health: 33% adult obesity, 12% smoke.
- 2.9 people per household (vs Illinois avg 2.5).
- 22% non-family households (singles, roommates) (vs Illinois 38%).
- 88 dependents per 100 working-age (youth + seniors / 18-64) (vs Illinois 64).
Population & Trend
Current population 3,711; figures track the most recent Census ACS 5-year estimates.
| Census data vintage | 2024 |
|---|---|
| Population | 5,275,541 people |
| Population | 3,711 people (vs Illinois 39,460) |
| Population Estimate | 3,711 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 41.2y is 2.3 years older than the U.S. median (38.9y). Children under 18 make up 29% — above the U.S. share of ~22%.
| Age Summary · Median age | 41.2 years (vs Illinois 37.7y) |
|---|---|
| Age Summary · Children Pct | 28.9% |
| Age Summary · Character | established |
| Age Summary · Total Pop | 3,711 |
| Age Summary · Under 18 | 1,073 |
| Age Summary · 18 To 34 | 453.0× |
| Age Summary · 35 To 64 | 1,525.0× |
| Age Summary · 65 Plus | 660 |
| Population under 18 | 1,073 |
| Median age | 41.2 years (vs Illinois 37.7y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 3,711 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.23 (0 = single group, 1 = perfectly even distribution); this is read as somewhat diverse.
| White residents | 3,107 |
|---|---|
| Asian residents | 329 |
| Hispanic or Latino residents | 129 |
| Diversity Index · Diversity index (Simpson) | 23.1% |
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 3 |
| Diversity Index · Largest group share | 87.2% |
| Asian population | 8.0% (vs Illinois 6.1%) |
| Hispanic or Latino population | 3.3% (vs Illinois 17.6%) |
| White (non-Hispanic) population | 79.6% (vs Illinois 54.8%) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Ancestry
Self-reported ancestry from Census ACS — what residents report as their ethnic origin, separate from race. Counts can exceed population because people can list multiple ancestries.
Top (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 0.1% are foreign-born — below the U.S. average of 13.9%. 15% have naturalized to U.S. citizenship.
| Residents born in this state | 2,151 |
|---|---|
| Residents born in another state | 992 |
| Share born in this state | 58.0% |
| Share born in another state | 42.0% |
| Native-born U.S. citizens | 26.7% |
| Foreign-born residents | 0.1% |
| Naturalized citizens | 15.2% |
| Total foreign-born residents | 483 |
| From Europe | 231 |
| From Africa | 183 |
Households & Family Composition
1,285 households. Averaging 2.8 people each — larger than the U.S. average of 2.5. 78% are family households — above the U.S. share of ~65%. Of 957 families, 41% are married couples with children.
| Children under 18 | 1,028 |
|---|---|
| Total families | 957 |
| Married couples with children | 396 |
| Average household size | 2.79 |
| Women who gave birth (past year) | 13.0% |
| Grandparents living with grandchildren | 136 |
| Grandparents responsible for grandchildren | 76 |
| Family households | 1,001 households (vs Illinois 9,709) |
| Households that are families | 77.9% (vs Illinois 62.4%) |
| Total households | 1,285 households (vs Illinois 14,867) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 9.0% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 127,111 residents per year on net (IRS migration data).
| Moved within the county (past year) | 9.0% |
|---|---|
| Migration · People moving in (annual) | 4,217,303 |
| Migration · People moving out (annual) | 4,344,414 |
| Migration · Net migration (in − out) | -127,111 |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Disability
Census ACS measures self-reported functional limitations — vision, hearing, mobility, cognitive, self-care, or independent-living. The U.S. baseline disability rate is about 12–13%; rates trend higher with median age.
| Residents with a disability | 166 |
|---|---|
| Disability rate | 4.6% |
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 39 residents live in group quarters (1.1% of population).
| Living in group quarters | 39 |
|---|
Other
| Congressional District · District | 5 |
|---|---|
| Congressional District · Formatted | IL-05 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 17031 |
| Cdc Birth Rate · State Fips | 17 |
| Cdc Birth Rate · County Fips | 031 |
| Cdc Birth Rate · County | Cook |
| Cdc Birth Rate · Birth Rate | 15.3% |
| Cdc Birth Rate · Lower Ci | 14.90 |
| Cdc Birth Rate · Upper Ci | 15.70 |
| Cdc Mortality · Fips | 17031 |
| Cdc Mortality · County | Cook County |
| Cdc Mortality · Urban Rural | Large central metro |
| Cdc Mortality · Total Deaths 2020 2023 | 165,505 |
| Cdc Vaccination · Fips | 17031 |
| Cdc Vaccination · County | Cook County |
| Cdc Vaccination · Dose1 Pop Pct | 84.0% |
| Cdc Vaccination · Series Complete Pct | 75.2% |
| Cdc Vaccination · Booster Pct | 58.5% |
| Cdc Vaccination · Population 2019 | 5,150,233 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 20 |
| Family Score · Childcare Centers | 1 |
| Family Score · Children Pct | 28.9% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 3,711, established, affluent, white collar, high crime |
| Town Summary · Population | 3,711 people (vs Illinois 39,460) |
| Town Summary · County | Cook County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade